[ViewVC] Diff of: cvs/deliantra/server/socket/lowlevel.C

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC

…		…
1	/*	1	/*
2	CrossFire, A Multiplayer game for X-windows	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3		3	*
4	Copyright (C) 1992 Frank Tore Johansen	4	* Copyright (©) 2018 Marc Alexander Lehmann / the Deliantra team
5		5	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
6	This program is free software; you can redistribute it and/or modify	6	*
		7	* Deliantra is free software: you can redistribute it and/or modify it under
7	it under the terms of the GNU General Public License as published by	8	* the terms of the Affero GNU General Public License as published by the
8	the Free Software Foundation; either version 2 of the License, or	9	* Free Software Foundation, either version 3 of the License, or (at your
9	(at your option) any later version.	10	* option) any later version.
10		11	*
11	This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.	15	* GNU General Public License for more details.
15		16	*
16	You should have received a copy of the GNU General Public License	17	* You should have received a copy of the Affero GNU General Public License
17	along with this program; if not, write to the Free Software	18	* and the GNU General Public License along with this program. If not, see
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.	19	* <http://www.gnu.org/licenses/>.
19
20	The author can be reached via e-mail to mark@pyramid.com
21	*/
22
23	/**
24	* \file
25	* Low-level socket-related functions.
26	*	20	*
27	* \date 2003-12-02	21	* The authors can be reached via e-mail to <support@deliantra.net>
28	*
29	* Contains some base functions that both the client and server
30	* can use. As such, depending what we are being compiled for will
31	* determine what we can include. the client is designed have
32	* CFCLIENT defined as part of its compile flags.
33	*/	22	*/
34		23
35	using namespace std;
36
37	#include <global.h>	24	#include <global.h>
38	#include <newclient.h>
39	#include <sproto.h>	25	#include <sproto.h>
40	#include <cstdarg>	26	#include <cstdarg>
41		27
42	#ifdef __linux__	28	#if HAVE_TCP_INFO
43	# include <sys/types.h>	29	# include <sys/types.h>
44	# include <sys/socket.h>	30	# include <sys/socket.h>
45	# include <netinet/in.h>	31	# include <netinet/in.h>
46	# define TCP_HZ 1000 // sorry...
47	# include <netinet/tcp.h>	32	# include <netinet/tcp.h>
48	#endif	33	#endif
49		34
50	// use a really low timeout, as it doesn't cost any bandwidth, and you can	35	using namespace std;
51	// easily die in 20 seconds...
52	#define SOCKET_TIMEOUT1 10
53	#define SOCKET_TIMEOUT2 20
54		36
55	void	37	// force a packet when idle for more than this many seconds,
56	Socket_Flush (client_socket * ns)	38	// forcing an ack regularly.
57	{	39	#define IDLE_PING 2.
58	#ifdef __linux__
59	// check time of last ack, and, if too old, kill connection
60	struct tcp_info tcpi;
61	socklen_t len = sizeof (tcpi);
62		40
63	if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))	41	void
64	{	42	client::flush ()
65	unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;	43	{
		44	if (destroyed ())
		45	return;
66		46
67	if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s	47	/**
68	&& SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s	48	* Writes data to socket.
69	{	49	*
70	LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,	50	* When the socket is clear to write, and we have backlogged data, this
71	(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);	51	* is called to write it out.
72	ns->status = Ns_Dead;	52	*/
		53
		54	// write a nop to the socket at least every IDLE_PING seconds.
		55	if (!outputbuffer.len)
		56	{
		57	if (last_send + IDLE_PING <= NOW && pl && pl->active)
73	}	58	{
		59	// this is a bit ugly, but map1a seems to be the only
		60	// nop'able command and it is quite small.
		61	packet sl ("map1a");
		62	send_packet (sl);
		63	}
		64	else
		65	return;
		66	}
		67
		68	if (socket_ev.poll () & EV_WRITE)
		69	return;
		70
		71	last_send = NOW;
		72	write_outputbuffer ();
		73	}
		74
		75	void
		76	client::write_outputbuffer ()
		77	{
		78	while (outputbuffer.len)
74	}	79	{
		80	int res = write (fd, outputbuffer.data + outputbuffer.start,
		81	min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
75		82
76	int val;	83	if (res > 0)
		84	{
		85	outputbuffer.start += res;
		86	/* wrap back to start of buffer */
		87	if (outputbuffer.start == SOCKETBUFSIZE)
		88	outputbuffer.start = 0;
77		89
78	val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	90	outputbuffer.len -= res;
79	val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));	91	}
80	#endif	92	else if (res == 0)
81	}	93	{
		94	LOG (llevError, "socket write failed, connection closed.\n");
		95	destroy ();
		96	return;
		97	}
		98	else if (errno == EINTR)
		99	{
		100	// just retry
		101	}
		102	else if (errno == EAGAIN)
		103	{
		104	// delay till ready
		105	socket_ev.poll (socket_ev.poll () \| EV_WRITE);
		106	socket_ev.start ();
		107	return;
		108	}
		109	else
		110	{
		111	LOG (llevError, "socket write failed: %s\n", strerror (errno));
		112	destroy ();
		113	return;
		114	}
		115	}
82		116
		117	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		118	}
		119
		120	/******************************************************************************
		121	*
		122	* Start of read routines.
		123	*
		124	******************************************************************************/
		125
		126	int
		127	client::next_packet ()
		128	{
		129	if (inbuf_len >= 2)
		130	{
		131	int pkt_len = (inbuf [0] << 8) \| inbuf [1];
		132
		133	if (inbuf_len >= 2 + pkt_len)
		134	return 2 + pkt_len;
		135
		136	if (inbuf_len == sizeof (inbuf))
		137	{
		138	send_packet_printf ("msg %d log input buffer overflow - closing connection.", NDI_RED \| NDI_REPLY);
		139	destroy ();
		140	return -1;
		141	}
		142	}
		143
		144	return 0;
		145	}
		146
		147	void
		148	client::skip_packet (int len)
		149	{
		150	inbuf_len -= len;
		151	memmove (inbuf, inbuf + len, inbuf_len);
		152	}
		153
83	/***********************************************************************	154	/*****************************************************************************
84	*	155	* Start of command dispatch area.
85	* packet functions/utilities	156	* The commands here are protocol commands.
86	*
87	**********************************************************************/	157	****************************************************************************/
88		158
89	packet &packet::operator <<(const data &v)	159	// SocketCommand, PlayingCommand, should not exist with those ugly casts
		160	#define SC(cb) (void )static_cast<void ()(char , int, client )>(cb),
		161	#define PC(cb) (void )static_cast<void ()(char , int, player )>(cb), PF_PLAYER \|
		162
		163	static void
		164	NopCmd (char , int, client )
90	{	165	{
91	if (room () < v.len)	166	// do nothing
92	reset ();	167	}
		168
		169	/**
		170	* Dispatch table for the server.
		171	*/
		172	static struct packet_type packets[] = {
		173	{"command", PC(PlayerCmd) PF_PLAYING \| PF_COMMAND },
		174
		175	{"examine", PC(ExamineCmd) PF_PLAYING },
		176	{"ex", PC(ExCmd) PF_PLAYING },
		177	{"apply", PC(ApplyCmd) PF_PLAYING },
		178	{"lookat", PC(LookAt) PF_PLAYING },
		179	{"lock", PC(LockItem) PF_PLAYING },
		180	{"mark", PC(MarkItem) PF_PLAYING },
		181	{"move", PC(MoveCmd) PF_PLAYING },
		182	{"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
		183	{"mapredraw", PC(MapRedrawCmd) 0 },
		184	{"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
		185
		186	{"reply", SC(ReplyCmd) 0 },
		187	{"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
		188	{"addme", SC(AddMeCmd) 0 },
		189	{"askface", SC(AskFaceCmd) 0 },
		190	{"requestinfo", SC(RequestInfo) 0 },
		191	{"setsound", SC(SetSound) 0 },
		192	{"setup", SC(SetUp) 0 },
		193	{"version", SC(VersionCmd) 0 },
		194
		195	{"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
		196	};
		197
		198	bool
		199	client::may_execute (const packet_type *pkt) const
		200	{
		201	return (!(pkt->flags & PF_PLAYER) \|\| pl)
		202	&& (!(pkt->flags & PF_PLAYING) \|\| state == ST_PLAYING);
		203	}
		204
		205	// HACK: some commands currently should be executed
		206	// even when the player is frozen. this hack detects
		207	// those commands. it should be folded into may_execute,
		208	// but kept seperate to emphasise the hack aspect, i.e.
		209	// do it better, then remove.
		210	static bool
		211	always_immediate (const client ns, const packet_type pkt, const char *data, int len)
		212	{
		213	if (!(pkt->flags & PF_COMMAND))
		214	return false;
		215
		216	if (!ns->pl \|\| !ns->pl->ob \|\| !ns->pl->ob->map)
		217	return false;
		218
		219	if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
		220	if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
		221	if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
		222	if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
		223	if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
		224
		225	if (len == 7 && !strcmp (data, "suicide")) return true;
		226
		227	return false;
		228	}
		229
		230	void
		231	client::execute (const packet_type pkt, char data, int datalen)
		232	{
		233	if (may_execute (pkt) \|\| always_immediate (this, pkt, data, datalen))
		234	{
		235	//TODO: only one format
		236	if (pkt->flags & PF_PLAYER)
		237	{
		238	((void ()(char , int, player ))pkt->cb)((char )data, datalen, pl);
		239	pl->need_updated_stats ();
		240	}
		241	else
		242	((void ()(char , int, client ))pkt->cb)((char )data, datalen, this);
		243	}
93	else	244	else
		245	send_packet_printf ("msg %d log ERROR: you cannot execute '%s' now.", NDI_RED \| NDI_REPLY, pkt->name);
		246	}
		247
		248	bool
		249	client::handle_packet ()
		250	{
		251	int pkt_len = next_packet ();
		252
		253	if (!pkt_len)
		254	return false;
		255	else if (pkt_len < 0)
		256	{
		257	LOG (llevError, "read error on player %s\n",
		258	pl && pl->ob ? &pl->ob->name : "[anonymous]");
		259	destroy ();
		260	return false;
94	{	261	}
95	if (v.len)	262
		263	uint8_t save_byte = inbuf [pkt_len]; // rather ugly
		264	inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
		265
		266	/* First, break out beginning word. There are at least
		267	* a few commands that do not have any paremeters. If
		268	* we get such a command, don't worry about trying
		269	* to break it up.
		270	*/
		271	int datalen;
		272	char data = strchr ((char )inbuf + 2, ' ');
		273
		274	if (data)
		275	{
		276	*data++ = 0;
		277	datalen = pkt_len - (data - (char *)inbuf);
		278	}
		279	else
		280	{
		281	data = (char *)inbuf + 2; // better read garbage than segfault
		282	datalen = 0;
		283	}
		284
		285	for (packet_type *pkt = packets; pkt < packets + ecb_array_length (packets); ++pkt)
		286	if (!strcmp ((char *)inbuf + 2, pkt->name))
96	{	287	{
97	memcpy (cur, v.ptr, v.len);	288	if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
98	cur += v.len;	289	queue_command (pkt, data, datalen);
		290	else
		291	execute (pkt, data, datalen);
		292
		293	goto next_packet;
		294	}
		295
		296	// If we get here, we didn't find a valid command.
		297	send_packet_printf ("msg %d log ERROR: command '%s' not supported.", NDI_RED \| NDI_REPLY, (char *)inbuf + 2);
		298
		299	next_packet:
		300	inbuf [pkt_len] = save_byte; // rather ugly
		301	skip_packet (pkt_len);
		302
		303	// input buffer has space again
		304	socket_ev.poll (socket_ev.poll () \| EV_READ);
		305
		306	return true;
		307	}
		308
		309	void
		310	client::inbuf_handle ()
		311	{
		312	if (!handle_packet ())
		313	return;
		314
		315	while (handle_packet ())
		316	;
		317
		318	flush ();
		319	}
		320
		321	// callback called when socket is either readable or writable
		322	void
		323	client::socket_cb (iow &w, int revents)
		324	{
		325	//TODO remove when we have better socket cleanup logic
		326	if (destroyed ())
		327	{
		328	socket_ev.poll (0);
		329	return;
		330	}
		331
		332	if (revents & EV_WRITE)
		333	{
		334	write_outputbuffer ();
		335
		336	if (!outputbuffer.len)
		337	socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
		338	}
		339
		340	if (revents & EV_READ)
		341	{
		342	int amount;
		343	uint8 *rbuf;
		344
		345	if (ws_version)
99	}	346	{
100	}	347	if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
		348	ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
101		349
102	return *this;	350	rbuf = ws_inbuf + ws_inbuf_len;
103	}	351	amount = ws_inbuf_alloc - ws_inbuf_len;
104
105	packet &packet::operator <<(const data8 &v)
106	{
107	unsigned int len = min (v.len, 0x00FF);
108	return *this << uint8 (len) << data (v.ptr, len);
109	}
110
111	packet &packet::operator <<(const data16 &v)
112	{
113	unsigned int len = min (v.len, 0xFFFF);
114	return *this << uint16 (len) << data (v.ptr, len);
115	}
116
117	packet &packet::operator <<(const char *v)
118	{
119	return *this << data (v, strlen (v ? v : 0));
120	}
121
122	void
123	packet::printf (const char *format, ...)
124	{
125	int size = room ();
126
127	va_list ap;
128	va_start (ap, format);
129	int len = vsnprintf ((char *)cur, size, format, ap);
130	va_end (ap);
131
132	if (len >= size)
133	return reset ();
134
135	cur += len;
136	}
137
138	/******************************************************************************
139	*
140	* Start of read routines.
141	*
142	******************************************************************************/
143
144	int
145	client_socket::read_packet ()
146	{
147	for (;;)
148	{
149	if (inbuf_len >= 2)
150	{	352	}
151	unsigned int pkt_len = (inbuf [0] << 8) \| inbuf [1];	353	else
152
153	if (inbuf_len >= 2 + pkt_len)
154	return pkt_len + 2;
155	}	354	{
156		355	rbuf = inbuf + inbuf_len;
157	int amount = sizeof (inbuf) - inbuf_len;	356	amount = sizeof (inbuf) - inbuf_len;
158
159	if (amount <= 0)
160	{	357	}
161	LOG (llevError, "packet too large");//TODO
162	return -1;
163	}
164
165	amount = read (fd, inbuf + inbuf_len, amount);
166		358
167	if (!amount)	359	if (!amount)
168	{	360	{
169	status = Ns_Dead;	361	// input buffer full
		362	LOG (llevError, "input buffer overflow.");
		363	destroy ();
170	return -1;	364	return;
		365	}
		366
		367	amount = read (fd, rbuf, amount);
		368
		369	if (!amount)
		370	{
		371	destroy ();
		372	return;
171	}	373	}
172	else if (amount < 0)	374	else if (amount < 0)
173	{	375	{
174	if (errno != EAGAIN && errno != EINTR)	376	if (errno != EAGAIN && errno != EINTR)
175	{	377	{
176	LOG (llevError, "read error: %s", strerror (errno));	378	LOG (llevError, "read error: %s\n", strerror (errno));
		379	destroy ();
177	return -1;	380	return;
178	}	381	}
179		382
180	return 0;	383	// should not be here, normally
		384	}
		385
		386	if (ws_version)
181	}	387	{
		388	ws_inbuf_len += amount;
182		389
		390	while (ws_inbuf_len)
		391	{
		392	if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
		393	break;
		394
		395	int d = 2;
		396	int fin = ws_inbuf [0] & 0x80;
		397	int op = ws_inbuf [0] & 0x0f;
		398	int len = ws_inbuf [1] & 0x7f;
		399
		400	if (len == 126)
		401	{
		402	len = (ws_inbuf [2] << 8) \| ws_inbuf [3];
		403	d += 2;
		404	}
		405	else if (len == 127)
		406	{
		407	if (ws_inbuf_len < 2 + 8)
		408	return;
		409
		410	// we don't do extra long frames, if a browser wants to send >2**32 bytes,
		411	// there are bigger issues to fix.
		412	len = (ws_inbuf [8] << 8) \| ws_inbuf [9];
		413	d += 8;
		414	}
		415
		416	// we only continue if we have a complete frame
		417	if (ws_inbuf_len < d + 4 + len)
		418	return;
		419
		420	switch (op)
		421	{
		422	case 0: op = ws_inbuf_type; break; // continuation
		423	case 1: ws_inbuf_type = 1; break; // utf-8
		424	case 2: ws_inbuf_type = 2; break; // binary
		425	}
		426
		427	if (len > sizeof (inbuf) - inbuf_len)
		428	{
		429	// input buffer full
		430	LOG (llevError, "input buffer overflow (ws).");
		431	destroy ();
		432	return;
		433	}
		434
		435	uint8 *buf = inbuf + inbuf_len + 2;
		436
		437	for (int i = 0; i < len; ++i)
		438	buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
		439
		440	// remove frame
		441	ws_inbuf_len -= d + 4 + len;
		442	memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
		443
		444	switch (op)
		445	{
		446	case 1: // utf-8
		447	// utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
		448	// but we assume that these extra-long packets will be rare.
		449	{
		450	uint8 *a = buf;
		451	uint8 *b = a;
		452	uint8 *c = a + len;
		453
		454	for (; a < c; ++a, ++b)
		455	{
		456	b = a;
		457
		458	if (*a >= 0x80)
		459	*b = (a [0] & 0x1f) << 6 \| (a [1] & 0x3f), ++a;
		460	}
		461
		462	len -= a - b;
		463	}
		464	/* FALLTHROUGH */
		465	case 2: // binary
		466	inbuf_len += len;
		467
		468	if (fin)
		469	{
		470	inbuf [0] = inbuf_len >> 8;
		471	inbuf [1] = inbuf_len;
		472
		473	inbuf_len += 2;
		474
		475	inbuf_handle ();
		476	}
		477	break;
		478
		479	case 9: // ping
		480	{
		481	// send pong - we assume ping messages are <64k
		482	// as we can't handle >10k at the moment anyway.
		483	uint8 hdr [] = { 0x8a, 126, len >> 8, len };
		484	send (hdr, sizeof (hdr));
		485	send (inbuf + inbuf_len, len);
		486	}
		487	break;
		488
		489	case 10: // pong
		490	break;
		491
		492	case 8: // close
		493	default:
		494	destroy ();
		495	return;
		496	}
		497	}
		498	}
		499	else
		500	{
183	inbuf_len += amount;	501	inbuf_len += amount;
184		502	inbuf_handle ();
185	cst_tot.ibytes += amount;	503	}
186	cst_lst.ibytes += amount;
187	}	504	}
188	}
189
190	void
191	client_socket::skip_packet (int len)
192	{
193	inbuf_len -= len;
194	memmove (inbuf, inbuf + len, inbuf_len);
195	}	505	}
196		506
197	/*******************************************************************************	507	/*******************************************************************************
198	*	508	*
199	* Start of write related routines.	509	* Start of write related routines.
204	* Adds data to a socket buffer for whatever reason.	514	* Adds data to a socket buffer for whatever reason.
205	*	515	*
206	* ns is the socket we are adding the data to, buf is the start of the	516	* ns is the socket we are adding the data to, buf is the start of the
207	* data, and len is the number of bytes to add.	517	* data, and len is the number of bytes to add.
208	*/	518	*/
209		519	void
210	static void	520	client::send (void *buf_, int len)
211	add_to_buffer (client_socket ns, char buf, int len)
212	{	521	{
		522	char buf = (char )buf_;
		523
		524	if (destroyed () \|\| !buf)
		525	return;
		526
		527	if (len + outputbuffer.len > SOCKETBUFSIZE)
		528	{
		529	LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
		530	// shutdown the socket, this is safer than destroying it immediately
		531	// as lots of code in the callchain might still access the map etc.
		532	shutdown (fd, SHUT_RDWR);
		533	return;
		534	}
		535
213	int avail, end;	536	int avail, end;
214
215	if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216	{
217	LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218	ns->status = Ns_Dead;
219	return;
220	}
221		537
222	/* data + end is where we start putting the new data. The last byte	538	/* data + end is where we start putting the new data. The last byte
223	* currently in use is actually data + end -1	539	* currently in use is actually data + end -1
224	*/	540	*/
225
226	end = ns->outputbuffer.start + ns->outputbuffer.len;	541	end = outputbuffer.start + outputbuffer.len;
227	/* The buffer is already in a wrapped state, so adjust end */	542	/* The buffer is already in a wrapped state, so adjust end */
228	if (end >= SOCKETBUFSIZE)	543	if (end >= SOCKETBUFSIZE)
229	end -= SOCKETBUFSIZE;	544	end -= SOCKETBUFSIZE;
230		545
231	avail = SOCKETBUFSIZE - end;	546	avail = SOCKETBUFSIZE - end;
232		547
233	/* We can all fit it behind the current data without wrapping */	548	/* We can all fit it behind the current data without wrapping */
234	if (avail >= len)	549	if (avail >= len)
235	memcpy (ns->outputbuffer.data + end, buf, len);	550	memcpy (outputbuffer.data + end, buf, len);
236	else	551	else
237	{	552	{
238	memcpy (ns->outputbuffer.data + end, buf, avail);	553	memcpy (outputbuffer.data + end, buf, avail);
239	memcpy (ns->outputbuffer.data, buf + avail, len - avail);	554	memcpy (outputbuffer.data, buf + avail, len - avail);
240	}	555	}
241		556
242	ns->outputbuffer.len += len;	557	outputbuffer.len += len;
243	#if 0
244	LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245	#endif
246	}
247
248	/**
249	* Writes data to socket.
250	*
251	* When the socket is clear to write, and we have backlogged data, this
252	* is called to write it out.
253	*/
254	void
255	write_socket_buffer (client_socket * ns)
256	{
257	int amt, max;
258
259	if (ns->outputbuffer.len == 0)
260	{
261	LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262	return;
263	}
264
265	do
266	{
267	max = SOCKETBUFSIZE - ns->outputbuffer.start;
268	if (ns->outputbuffer.len < max)
269	max = ns->outputbuffer.len;
270
271	do
272	{
273	amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274	}
275	while ((amt < 0) && (errno == EINTR));
276
277	if (amt < 0)
278	{ /* We got an error */
279
280	if (errno != EWOULDBLOCK)
281	{
282	LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283	ns->status = Ns_Dead;
284	return;
285	}
286	else
287	{ /* EWOULDBLOCK */
288	/* can't write it, so store it away. */
289	ns->can_write = 0;
290	return;
291	}
292	}
293	ns->outputbuffer.start += amt;
294	/* wrap back to start of buffer */
295	if (ns->outputbuffer.start == SOCKETBUFSIZE)
296	ns->outputbuffer.start = 0;
297	ns->outputbuffer.len -= amt;
298	#ifdef CS_LOGSTATS
299	cst_tot.obytes += amt;
300	cst_lst.obytes += amt;
301	#endif
302	}
303	while (ns->outputbuffer.len > 0);
304	}
305
306	/**
307	* This writes data to the socket. - It is very low level -
308	* all we try and do is write out the data to the socket
309	* provided (ns). buf is the data to write, len is the number
310	* of bytes to write. IT doesn't return anything - rather, it
311	* updates the ns structure if we get an error.
312	*/
313	void
314	client_socket::send (void *buf_, int len)
315	{
316	char buf = (char )buf_;
317	char *pos = buf;
318	int amt = 0;
319
320	if (status == Ns_Dead \|\| !buf)
321	{
322	LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323	return;
324	}
325
326	#ifndef __GNU__ /* This caused problems on Hurd */
327	if (!can_write)
328	{
329	add_to_buffer (this, buf, len);
330	return;
331	}
332	#endif
333
334	/* If we manage to write more than we wanted, take it as a bonus */
335	while (len > 0)
336	{
337	do
338	{
339	amt = write (fd, pos, len);
340	}
341	while ((amt < 0) && (errno == EINTR));
342
343	if (amt < 0)
344	{ /* We got an error */
345	if (errno != EWOULDBLOCK)
346	{
347	LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348	errno, strerror (errno));
349	status = Ns_Dead;
350	return;
351	}
352	else
353	{ /* EWOULDBLOCK */
354	/* can't write it, so store it away. */
355	add_to_buffer (this, pos, len);
356	can_write = 0;
357	return;
358	}
359	}
360	/* amt gets set to 0 above in blocking code, so we do this as
361	* an else if to make sure we don't reprocess it.
362	*/
363	else if (amt == 0)
364	LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366	len -= amt;
367	pos += amt;
368	#ifdef CS_LOGSTATS
369	cst_tot.obytes += amt;
370	cst_lst.obytes += amt;
371	#endif
372	}
373	}	558	}
374		559
375	/**	560	/**
376	* Takes a string of data, and writes it out to the socket. A very handy	561	* Takes a string of data, and writes it out to the socket. A very handy
377	* shortcut function.	562	* shortcut function.
378	*/	563	*/
379
380	void	564	void
381	client_socket::send_packet (packet &sl)	565	client::send_packet (packet &sl)
382	{	566	{
383	Send_With_Handling (this, &sl);	567	if (destroyed ())
384	}
385
386	void
387	client_socket::send_packet (const char *buf, int len)
388	{
389	packet sl;
390
391	sl << data (buf, len);
392	send_packet (sl);
393	}
394
395	void
396	client_socket::send_packet (const char *buf)
397	{
398	send_packet (buf, strlen (buf));
399	}
400
401	/**
402	* Calls Write_To_Socket to send data to the client.
403	*
404	* The only difference in this function is that we take a packet
405	*, and we prepend the length information.
406	*/
407	void
408	Send_With_Handling (client_socket ns, packet msg)
409	{
410	unsigned char sbuf[4];
411
412	if (ns->status == Ns_Dead \|\| !msg)
413	return;	568	return;
414		569
415	if (msg->length () >= MAXSOCKBUF)	570	if (sl.length () > MAXSOCKBUF)
416	{	571	{
417	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ());	572	LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
418	/* Almost certainly we've overflowed a buffer, so quite now to make	573	/* Almost certainly we've overflowed a buffer, so quit now to make
419	* it easier to debug.	574	* it easier to debug.
420	*/	575	*/
421	abort ();	576	abort ();
422	}	577	}
423		578
424	sbuf[0] = ((uint32) (msg->length ()) >> 8);	579	if (!sl.length ())
425	sbuf[1] = ((uint32) (msg->length ()) );
426
427	//TODO: single write, or writev
428	ns->send (sbuf, 2);
429	ns->send (msg->buf, msg->length ());
430	}
431
432	/******************************************************************************
433	*
434	* statistics logging functions.
435	*
436	******************************************************************************/
437
438	#ifdef CS_LOGSTATS
439
440	/* cst_tot is for the life of the server, cst_last is for the last series of
441	* stats
442	*/
443	CS_Stats cst_tot, cst_lst;
444
445	/**
446	* Writes out the gathered stats. We clear cst_lst.
447	*/
448	void
449	write_cs_stats (void)
450	{
451	time_t now = time (NULL);
452
453	/* If no connections recently, don't both to log anything */
454	if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
455	return;	580	return;
456		581
457	/* CSSTAT is put in so scripts can easily find the line */	582	if (ws_version == 8)
458	LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",	583	{
459	ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,	584	static uint8 buf [MAXSOCKBUF * 2 + 4];
460	now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
461	cst_lst.ibytes = 0;
462	cst_lst.obytes = 0;
463	cst_lst.time_start = now;
464	}
465	#endif
466		585
		586	uint8 *b = buf + 4;
		587	for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
		588	{
		589	if (*a < 0x80)
		590	b++ = a;
		591	else
		592	{
		593	b++ = 0xc0 \| ((a >> 6) & 0x1f);
		594	b++ = 0x80 \| ( a & 0x3f);
		595	}
		596	}
		597
		598	assert (b - buf < sizeof (buf));
		599
		600	int len = b - (buf + 4);
		601
		602	if (len < 126)
		603	{
		604	buf [2] = 0x81;
		605	buf [3] = len;
		606
		607	send (buf + 2, len + 2);
		608	}
		609	else
		610	{
		611	buf [0] = 0x81;
		612	buf [1] = 126;
		613	buf [2] = len >> 8;
		614	buf [3] = len;
		615
		616	send (buf, len + 4);
		617	}
		618	}
		619	else if (ws_version == 13)
		620	{
		621	int len = sl.length ();
		622
		623	if (len < 126)
		624	{
		625	uint8 hdr [] = { 0x82, len };
		626	send (hdr, sizeof (hdr));
		627	}
		628	else
		629	{
		630	uint8 hdr [] = { 0x82, 126, len >> 8, len };
		631	send (hdr, sizeof (hdr));
		632	}
		633
		634	send (sl.buf_ + sl.hdrlen, len);
		635	}
		636	else
		637	{
		638	assert (sl.hdrlen == 2);
		639
		640	sl.buf_ [0] = sl.length () >> 8;
		641	sl.buf_ [1] = sl.length () ;
		642
		643	send (sl.buf_, sl.length () + sl.hdrlen);
		644	}
		645	}
		646
		647	void
		648	client::send_packet (const char *buf, int len)
		649	{
		650	packet sl;
		651
		652	sl << data_n (buf, len);
		653	send_packet (sl);
		654	}
		655
		656	void
		657	client::send_packet (const char *buf)
		658	{
		659	send_packet (buf, strlen (buf));
		660	}
		661
		662	void
		663	client::send_packet_printf (const char *format, ...)
		664	{
		665	packet sl;
		666
		667	va_list ap;
		668	va_start (ap, format);
		669	sl.vprintf (format, ap);
		670	va_end (ap);
		671
		672	send_packet (sl);
		673	}
		674
		675	void
		676	client::send_msg (int color, const char type, const char msg)
		677	{
		678	if (!msg \|\| !type) // it can happen (for example, missing attack messages cause this)
		679	{
		680	LOG (logBacktrace \| llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
		681	return;
		682	}
		683
		684	int len = strlen (msg);
		685
		686	if (!(color & NDI_VERBATIM)
		687	&& (msg_is_special (msg)
		688	\|\| (type [0] == 'c' && type [1] == '/') \|\| len > (MAXSOCKBUF - 128)))
		689	cfperl_send_msg (this, color, type, msg);
		690	else
		691	send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
		692	}
		693
		694	/***********************************************************************
		695	*
		696	* packet functions/utilities
		697	*
		698	**********************************************************************/
		699
		700	packet::packet (const char *name)
		701	{
		702	reset ();
		703
		704	int len = strlen (name);
		705	memcpy (cur, name, len); cur += len;
		706	*cur++ = ' ';
		707	}
		708
		709	packet &packet::operator <<(const ber32 v)
		710	{
		711	enum { maxlen = 32 / 7 + 1 };
		712	uint8 buf[maxlen];
		713	uint8 *p = buf + maxlen;
		714	uint32 val = v.val;
		715
		716	*--p = val & 0x7F;
		717
		718	while (val > 0x7F)
		719	{
		720	val >>= 7;
		721	*--p = (val & 0x7F) \| 0x80;
		722	}
		723
		724	return *this << data_n (p, buf + maxlen - p);
		725	}
		726
		727	packet &packet::operator <<(const data_n &v)
		728	{
		729	if (room () < v.len)
		730	reset ();
		731	else
		732	{
		733	if (v.len)
		734	{
		735	memcpy (cur, v.ptr, v.len);
		736	cur += v.len;
		737	}
		738	}
		739
		740	return *this;
		741	}
		742
		743	packet &packet::operator <<(const data8 &v)
		744	{
		745	unsigned int len = min (v.len, 0x00FF);
		746	return *this << uint8 (len) << data_n (v.ptr, len);
		747	}
		748
		749	packet &packet::operator <<(const data16 &v)
		750	{
		751	unsigned int len = min (v.len, 0xFFFF);
		752	return *this << uint16 (len) << data_n (v.ptr, len);
		753	}
		754
		755	packet &packet::operator <<(const char *v)
		756	{
		757	return *this << data_n (v, v ? strlen (v) : 0);
		758	}
		759
		760	void
		761	packet::vprintf (const char *format, va_list ap)
		762	{
		763	int size = room ();
		764
		765	int len = vsnprintf ((char *)cur, size, format, ap);
		766
		767	if (len >= size)
		768	return reset ();
		769
		770	cur += len;
		771	}
		772

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Comparing deliantra/server/socket/lowlevel.C (file contents): Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs. Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC

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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.102 by root, Wed Dec 5 19:03:27 2018 UTC